18971190 has 48 divisors (see below), whose sum is σ = 56373408. Its totient is φ = 4336128.

The previous prime is 18971189. The next prime is 18971203. The reversal of 18971190 is 9117981.

It is a super-2 number, since 2×18971190² = 719812100032200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14427 + ... + 15686.

It is an arithmetic number, because the mean of its divisors is an integer number (1174446).

Almost surely, 2^18971190 is an apocalyptic number.

18971190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18971190 is an abundant number, since it is smaller than the sum of its proper divisors (37402218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18971190 is a wasteful number, since it uses less digits than its factorization.

18971190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30133 (or 30130 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 36.

The square root of 18971190 is about 4355.5929561886. The cubic root of 18971190 is about 266.7052253271.

The spelling of 18971190 in words is "eighteen million, nine hundred seventy-one thousand, one hundred ninety".